PLAN_TABLE

PLAN_TABLE is the default table for results of the EXPLAIN PLAN statement. It is created by utlxplan.sql, and it contains one row for each step in the execution plan.

Column	Datatype	Description
`STATEMENT_ID`	`VARCHAR2(30)`	Optional statement identifier specified in the `EXPLAIN PLAN` statement
`TIMESTAMP`	`DATE`	Date and time when the `EXPLAIN PLAN` statement was issued
`REMARKS`	`VARCHAR2(80)`	Place for comments that can be added to the steps of the execution plan
`OPERATION`	`VARCHAR2(30)`	Name of the operation performed at this step
`OPTIONS`	`VARCHAR2(255)`	Options used for the operation performed at this step; the string returned by the index cost function
`OBJECT_NODE`	`VARCHAR2(128)`	Name of the database link used to reference the object
`OBJECT_OWNER`	`VARCHAR2(30)`	Owner of the object
`OBJECT_NAME`	`VARCHAR2(30)`	Name of the object
`OBJECT_INSTANCE`	`NUMBER(38)`	Numbered position of the object name in the original SQL statement
`OBJECT_TYPE`	`VARCHAR2(30)`	Descriptive modifier that further describes the type of object
`OPTIMIZER`	`VARCHAR2(255)`	Current mode of the optimizer
`SEARCH_COLUMNS`	`NUMBER`	Number of index columns with start and stop keys (that is, the number of columns with matching predicates)
`ID`	`NUMBER(38)`	Identification number for this step in the execution plan
`PARENT_ID`	`NUMBER(38)`	ID of the next step that operates on the results of this step
`POSITION`	`NUMBER(38)`	Order of processing for steps with the same parent ID. For cost-based optimization, the value in the first row of the plan is the statement's execution cost. For rule-based optimization, the value is null in the first row.
`COST`	`NUMBER(38)`	Cost of the current operation estimated by the cost-based optimizer (CBO)
`CARDINALITY`	`NUMBER(38)`	Number of rows returned by the current operation (estimated by the CBO)
`BYTES`	`NUMBER(38)`	Number of bytes returned by the current operation
`OTHER_TAG`	`VARCHAR2(255)`	Describes the function of the SQL text in the `OTHER` column. Values for `OTHER_TAG` are: `SERIAL` - SQL is the text of a locally-executed, serial query plan. Currently, SQL is not loaded in `OTHER` for this case. `SERIAL_FROM_REMOTE` - SQL text shown in the `OTHER` column will be executed at a remote site `PARALLEL_COMBINED_WITH_PARENT` - Parent of this operation is a DFO that performs both operations in the parallel execution plan `PARALLEL_COMBINED_WITH_CHILD` - Child of this operation is a DFO that performs both operations in the parallel execution plan. `PARALLEL_TO_SERIAL` - SQL text shown in the `OTHER` column is the top-level of the parallel plan. `PARALLEL_TO_PARALLEL` - SQL text shown in the `OTHER` column is executed and output in parallel `PARALLEL_FROM_SERIAL` - Operation consumes data from a serial operation and outputs it in parallel
`PARTITION_START`	`VARCHAR2(255)`	Start partition of a range of accessed partitions
`PARTITION_STOP`	`VARCHAR2(255)`	Stop partition of a range of accessed partitions
`PARTITION_ID`	`NUMBER(38)`	Step that has computed the pair of values of the `PARTITION_START` and `PARTITION_STOP` columns
`OTHER`	`LONG`	Information about parallel execution slaves and parallel queries
`DISTRIBUTION`	`VARCHAR2(30)`	Distribution method
`CPU_COST`	`NUMBER(38)`	User-defined CPU cost
`IO_COST`	`NUMBER(38)`	User-defined I/O cost
`TEMP_SPACE`	`NUMBER(38)`	Temporary space usage of the operation (sort or hash-join) as estimated by the optimizer's cost-based approach. For statements that use the rule-based approach, this column is null.
`ACCESS_PREDICATES`	`VARCHAR2(4000)`	Predicates used to locate rows in an access structure. For example, start or stop predicates for an index range scan.
`FILTER_PREDICATES`	`VARCHAR2(4000)`	Predicates used to filter rows before producing them
`PROJECTION`	`VARCHAR2(4000)`	Expressions produced by the operation
`TIME`	`NUMBER(38)`	Elapsed time (in seconds) of the operation as estimated by the optimizer's cost-based approach. For statements that use the rule-based approach, this column is null.